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Flip the form over and place it on a work surface, foam facing up. Use a drill/driver to remove the screws. Push on the tail ends of the form's short sides to tilt them down and away from the tabletop. Pull off the long sides and remove the foam.

Tip: If foam still sticks to the tabletop after it has cured, slip a razor blade under the edges of each piece and pry it off bit by bit.